\begin{tikzpicture}
    \pgfmathsetmacro{\R}{2}

    \begin{scope}[xshift=1.2cm,yshift=-2cm]
        \tkzDefPoints{0/0/r1, \R/0/r2}
        \tkzDrawSegments[xianduan={below=0pt}](r1,r2)
        \tkzLabelSegment[above](r1,r2){$R$}
    \end{scope}

    \tkzDefPoints{0/0/O_1, 3.5/0/O_2}
    \tkzDefCircle[R](O_1, 1.5)  \tkzGetPoint{o_1}
    \tkzDefCircle[R](O_2, 1)  \tkzGetPoint{o_2}
    \tkzDrawCircles[thick](O_1,o_1  O_2,o_2)
    \tkzDrawPoints(O_1, O_2)
    \tkzLabelPoints[below](O_1, O_2)
\end{tikzpicture}

